/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: NPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Netscape Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/NPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is 
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Gagan Saksena <gagan@netscape.com> (original author)
 *   Darin Fisher <darin@netscape.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or 
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the NPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the NPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "nsIURI.idl"

/**
 * The nsIURL interface provides convenience methods that further
 * break down the path portion of nsIURI:
 *
 * http://directory/fileBaseName.fileExtension?query
 * http://directory/fileBaseName.fileExtension#ref
 * http://directory/fileBaseName.fileExtension;param
 *       \          \                       /
 *        \          -----------------------
 *         \                   |          /
 *          \               fileName     /
 *           ----------------------------
 *                       |
 *                   filePath
 *
 * @status FROZEN
 */
[scriptable, uuid(d6116970-8034-11d3-9399-00104ba0fd40)]
interface nsIURL : nsIURI
{
    /*************************************************************************
     * The URL path is broken down into the following principal components:
     */

    /**
     * Returns a path including the directory and file portions of a
     * URL.  For example, the filePath of "http://foo/bar.html#baz" is
     * "/foo/bar.html".
     *
     * Some characters may be escaped.
     */
    attribute AUTF8String filePath;

    /**
     * Returns the parameters specified after the ; in the URL. 
     *
     * Some characters may be escaped.
     */
    attribute AUTF8String param;

    /**
     * Returns the query portion (the part after the "?") of the URL.
     * If there isn't one, an empty string is returned.
     *
     * Some characters may be escaped.
     */
    attribute AUTF8String query;

    /**
     * Returns the reference portion (the part after the "#") of the URL.
     * If there isn't one, an empty string is returned.
     *
     * Some characters may be escaped.
     */
    attribute AUTF8String ref;


    /*************************************************************************
     * The URL filepath is broken down into the following sub-components:
     */

    /**
     * Returns the directory portion of a URL. 
     * If the URL denotes a path to a directory and not a file,
     * e.g. http://foo/bar/, then the Directory attribute accesses
     * the complete /foo/bar/ portion, and the FileName is the 
     * empty string. If the trailing slash is omitted, then the
     * Directory is /foo/ and the file is bar (i.e. this is a 
     * syntactic, not a semantic breakdown of the Path).
     * And hence dont rely on this for something to be a definitely 
     * be a file. But you can get just the leading directory portion 
     * for sure.
     *
     * Some characters may be escaped.
     */
    attribute AUTF8String directory;

    /**
     * Returns the file name portion of a URL.
     * If the URL denotes a path to a directory and not a file,
     * e.g. http://foo/bar/, then the Directory attribute accesses
     * the complete /foo/bar/ portion, and the FileName is the 
     * empty string. Note that this is purely based on searching 
     * for the last trailing slash. And hence dont rely on this to 
     * be a definite file. 
     *
     * Some characters may be escaped.
     */
    attribute AUTF8String fileName;


    /*************************************************************************
     * The URL filename is broken down even further:
     */

    /**
     * Returns the file basename portion of a filename in a url.
     *
     * Some characters may be escaped.
     */
    attribute AUTF8String fileBaseName;

    /**
     * Returns the file extension portion of a filename in a url.  If a file
     * extension does not exist, the empty string is returned.
     *
     * Some characters may be escaped.
     */
    attribute AUTF8String fileExtension;

    /**
     * This method takes a uri and compares the two.  The common uri portion
     * is returned as a string.  The minimum common uri portion is the 
     * protocol, and any of these if present:  login, password, host and port
     * If no commonality is found, "" is returned.  If they are identical, the
     * whole path with file/ref/etc. is returned.  For file uris, it is
     * expected that the common spec would be at least "file:///" since '/' is
     * a shared common root.
     *
     * Examples:
     *    this.spec               aURIToCompare.spec        result
     * 1) http://mozilla.org/     http://www.mozilla.org/   ""
     * 2) http://foo.com/bar/     ftp://foo.com/bar/        ""
     * 3) http://foo.com:8080/    http://foo.com/bar/       ""
     * 4) ftp://user@foo.com/     ftp://user:pw@foo.com/    ""
     * 5) ftp://foo.com/bar/      ftp://foo.com/bar         ftp://foo.com/
     * 6) ftp://foo.com/bar/      ftp://foo.com/bar/b.html  ftp://foo.com/bar/
     * 7) http://foo.com/a.htm#i  http://foo.com/b.htm      http://foo.com/
     * 8) ftp://foo.com/c.htm#i   ftp://foo.com/c.htm       ftp://foo.com/c.htm
     * 9) file:///a/b/c.html      file:///d/e/c.html        file:///
     */
    AUTF8String getCommonBaseSpec(in nsIURI aURIToCompare);

    /**
     * This method takes a uri and returns a substring of this if it can be
     * made relative to the uri passed in.  If no commonality is found, the
     * entire uri spec is returned.  If they are identical, "" is returned.
     * Filename, query, etc are always returned except when uris are identical.
     */
    AUTF8String getRelativeSpec(in nsIURI aURIToCompare);

};
